Jupiter and Moon Have Close Encounter Tonight: See It Live Online

This sky map shows the location of Jupiter as it dances with the moon on the evening of Jan. 21, 2013. This diagram shows the appearance of the pair from Jan. 20 to Jan. 23rd, looking south, high in the evening sky.

Credit: Sky and Telescope magazine.

The planet Jupiter and Earth's moon will star is a dazzling spectacle in the night sky tonight, weather permitting. But even if bad weather spoils your view, you can see celestial show live online in a free webcast.

Jupiter and the moon will appear just a finger-width apart tonight (Jan. 21) for stargazers across North America. In South America, some observers may even see Jupiter slip behind the moon in an amazing occultation. The extreme close encounter between the planet and moon is a must-see, even if clouds block your view.

The online skywatching website Slooh Space Camera will provide free telescope views of Jupiter's encounter with the moon during a 30-minute webcast that begins at 9 p.m. EST (0200 GMT). You can watch the webcast of Jupiter and the moon on SPACE.com here tonight.

Slooh president Patrick Paolucci, astronomer Bob Berman of Astronomy Magazine and astro-imager Matt Francis of the Prescott Observatory will present the live views of Jupiter and the moon. You can access webcast directly here: http://www.slooh.com.

"By good fortune, the Great Red Spot will be traveling across the middle of Jupiter's disk during Slooh's live broadcast," Slooh officials said. Jupiter's Great Red Spot is a colossal storm at least twice the size of Earth that has been observed on Jupiter since the 1600s.

Jupiter and the moon will appear at their closest at different times depending on your viewing location, according to Sky & Telescope magazine. In Eastern North America, it will occur at 11:30 p.m. EST while further inland it occurs at 10 p.m. CST. Moving westward, the peak viewing time will be at 8:30 p.m. MST for stargazers in the Mountain Time Zone, while West Coast observers should look up at 7 p.m. PST.

There is even a chance for stargazers to see Jupiter in daylight, magazine officials said.

This table shows a list of viewing times and locations above the horizon to see Jupiter and the moon extremely close together on the night of Jan. 21, 2013.

Credit: SPACE.com/Joe Rao

"You'll also get an opportunity to attempt an unusual feat: spotting Jupiter in the late afternoon, before the sun sets," says Tony Flanders, associate editor at Sky & Telescope magazine and host of SkyWeek on PBS. "First locate the moon medium-high in the east; then look a few moon-widths left or lower left of the moon for Jupiter. It should be easy to spot with binoculars if the air is clear."

More seasoned amateur astronomers with good telescopes may want to search for Jupiter's moon Europa with their telescopes. The icy moon will cross in front of Jupiter as seen from Earth tonight between 8:13 p.m. to 10:37 p.m. EST (5:13 to 7:37 p.m. PST/ 0113 and 0337 GMT). Europa's shadow on the moon will cross Jupiter a bit later, from 10:22 p.m. to 12:46 a.m. EST (7:22 to 9:46 p.m. PST/0322 to 0546 GMT), magazine officials said.

There is one more bright object to check out during tonight's cosmic display: the bright star Aldebaran. The star will shin to the lower left of Jupiter throughout the evening. The star clusters Hyades and Pleiades also promise to dazzle, according to Sky & Telescope.

What appears north of the equator as a close conjunction between Jupiter and the moon on Jan. 21, 2013, becomes a full occultation in South America. In most of the occultation track, Jupiter passes behind the moon and re-emerges. But within the oval on the eastern end, the moon sets while Jupiter is still hidden, so only Jupiter's disappearance is visible.

Credit: Sky and Telescope Magazine

While Jupiter and the moon will appear extremely close to each other in the night sky, tonight's event won't be the last for the two objects. On March 17, Jupiter and the moon will have another change to appear to have a celestial encounter.

Editor's note: If you snap an amazing photo of Jupiter and the moon, or any other night sky view, that you'd like to share for a possible story or image gallery, send photos, comments and your name and location to managing editor Tariq Malik at spacephotos@space.com.

You can follow SPACE.com Managing Editor Tariq Malik on Twitter@tariqjmalik. Follow SPACE.com for the latest in space science and exploration news on Twitter@Spacedotcomand onFacebook.

Tariq joined Purch's Space.com team in 2001 as a staff writer, and later editor, covering human spaceflight, exploration and space science. He became Space.com's Managing Editor in 2009. Before joining Space.com, Tariq was a staff reporter for The Los Angeles Times. He is also an Eagle Scout (yes, he has the Space Exploration merit badge) and went to Space Camp four times as a kid and a fifth time as an adult. He has journalism degrees from the University of Southern California and New York University. To see his latest project, you can follow Tariq on Google+, Twitter and on Facebook.